Relief Generation Using Line Drawings

Line drawing is a kind of painting describing objects with monochrome lines.Relief is a sculpture of carving undulating images on a plane,a kind of art form between circular engrave and painting.Relief has a long history and has been spread widely.From the cliff painting in the primitive society,Egyptian tomb decoration in 25century BC,classical Greek sculpture in 5 century BC,to high-relief during the Renaissance in Europe,and then to various styles of reliefs later,in addition from surface decoration on bronze in China's Shang Dynasty,to stone relief and portrait brick in Han dynasty,and then to inscription,plaque and Thangka relief and so on,relief is an important art performance method,and one of important ways of cultural transmission.Making process of traditional relief intricate is time consuming and costly.This thesis puts forward a method to create 3D relief model based on line drawings.Our method is consisted of three phases,low-frequency generation,mid-frequency generation and high-frequency generation.The low-frequency generation refers to the main region in line drawing,such as a human body obtained by using Laplacian grid deformation algorithm.The mid-frequency generation refers to some regions such as limbs in the line drawings obtained by using Poisson diffusion based on distance transformation.High-frequency generation refers to the local details,such as eyebrow,flower,cloud and mountain in the background,generated by using Poisson diffusion with boundary constraint.Finally we add all three parts as height maps and transform the added height map into mesh model by triangularization.Additionally,we develop some interactive tools which allow users to edit models as desired.